Respuesta :

The answer is 1.3 gallons per day.

He uses 4 gallons for 3 days. We need to find a number of gallons (x) per 1 day.
Make a proportion:
4 gallons : 3 days = x : 1 day
x = 4 gallons * 1 day : 3 days
x = 4/3 gallons
x = 1.3 gallons